How many calories are burned with three miles on elliptical?

On average, humans move to the beat of 180 strides per minute. Assuming a 24" stride (each elliptical is a bit different) that puts it at 4 miles per hour. I know it looks slow but the fixed 24" stride is what kills this. Normal runners have 48" strides while jogging at a relaxed pace.
Anyway, you will be going at it almost 4 hours. I figure since you don't know, you will be dragging the last bit so I will keep it at 4 hours. Guessing an average of 800 calories per hour gives . . . . 3,200 calories.
Ta da.